Alright, the fact of the matter of life is that there is no way to know if there is an afterlife until you actually die. If there isnt one, then you just cease to exist and thus wont regret, remember, or anything about your life.
The universe may or may not have had a beginning.
I refer to the Matrix quote 'Everything that has a beginning has an end.' when I say that if the universe never began then it will never end. We as humans conceived infinity and yet we refuse to beleive that the universe or 'time' (Time is only the transfer of energy at the rate we perceive it, nothing more) is infinite. Since everything we know begins and ends we must apply it to that we do not yet fully understand.
We yearn to understand things that we don't, it is what makes us human.
There are three states of energy, balance, chaos, and order.
Balance is a state where, though there is energy present, no energy transfers.
Chaos is the uncontrolled and 'random' (Nothing is truely random, something random is simply something we cannot predict because we do not know all the factors.) state of energy, where tranfer happens extremely fast.
Order is energy in a loop that is controllable, such as the rotation of planets or ecosystems.
From everyday observations, one can conclude that the universe has been trying to reach a state of uttermost balance for its entire existance. At one point it might just have acheived that. Yet, something, perhaps god, keeps pushing it in the other direction, and with more force.
We, as humans, are an amazing source of chaotic energy. Think about that. We create so much uncontrollable energy in our world, such as wars, sports, and even the internet. Its all uncontrollable energy. It does not loop and it does not even out.
Whether you like it or not, travelling backward through time is impossible. In order to do so, one would have to manipulate EVERY source of energy in the universe. Even then, you have to find a way to reverse the flow of energy exactly. Energy flows either chaotically or orderly. It does not go backward.

Ouch, my brain hurts... Too much thinking...

Hmm, forgot my name again...